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Driver core: Add mutex for adding/removing memory blocks

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Add a new mutex for use in adding and removing of memory blocks.  This
is needed to avoid any race conditions in which the same memory block could
be added and removed at the same time.

Signed-off-by: Nathan Fontenot <nfont@austin.ibm.com>
Reviewed-by: Robin Holt <holt@sgi.com>
Reviewed-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Nathan Fontenot 2010-10-19 12:45:24 -05:00 committed by Greg Kroah-Hartman
parent e4619c857d
commit 2938ffbd46
1 changed files with 7 additions and 0 deletions
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7
drivers/base/memory.c
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@ -27,6 +27,8 @@
#include <asm/atomic.h>
#include <asm/uaccess.h>
static DEFINE_MUTEX(mem_sysfs_mutex);
#define MEMORY_CLASS_NAME "memory"
static struct sysdev_class memory_sysdev_class = {
@ -484,6 +486,8 @@ static int add_memory_block(int nid, struct mem_section *section,
if (!mem)
return -ENOMEM;
mutex_lock(&mem_sysfs_mutex);
mem->phys_index = __section_nr(section);
mem->state = state;
mutex_init(&mem->state_mutex);
@ -504,6 +508,7 @@ static int add_memory_block(int nid, struct mem_section *section,
ret = register_mem_sect_under_node(mem, nid);
}
mutex_unlock(&mem_sysfs_mutex);
return ret;
}
@ -512,6 +517,7 @@ int remove_memory_block(unsigned long node_id, struct mem_section *section,
{
struct memory_block *mem;
mutex_lock(&mem_sysfs_mutex);
mem = find_memory_block(section);
unregister_mem_sect_under_nodes(mem);
mem_remove_simple_file(mem, phys_index);
@ -520,6 +526,7 @@ int remove_memory_block(unsigned long node_id, struct mem_section *section,
mem_remove_simple_file(mem, removable);
unregister_memory(mem, section);
mutex_unlock(&mem_sysfs_mutex);
return 0;
}